So, the worst injury I've had was when I was playing Airsoft with my friend Tristan and a few of our other buddies by an abandoned factory that's around a mile from where I live. Tristan is a sniper, by the way. So we were kind of patrolling the factory, looking for a way to get to the catwalk that was above pretty much everything.
Now the airsoft gun I use is an ICS-91 Galil ARM, and Tristan uses an SSG24 Rifle. We found a staircase that led to a room with a door, and on the other side of that door, lo and behold, was a small platform connected to the catwalk. We stayed on the platform for a good couple minutes before we saw someone, and then two more people came. Tristan shot 2 of them, but the third one spotted us, along with a fourth and fifth who got there shortly after.
Tristan couldn't get a good line of sight on them, so I helped him out and put some shots down range. I backed up a bit far and ended up falling 10-12 feet off the platform. I landed on my back, and my leg bent back and under me.
Basically what I did is I dislocated my knee, and at the same time broke my Fibula. It was hella painful.
And I'm still in the cast.